Fix PHP warnings

www/showexp.php3

@@ -115,7 +115,7 @@ function Show($which, $arg1, $arg2)
 	         "     position: relative; height: 450px; ".
 	         "     width: 90%; border: 2px solid black;'>\n";
 	$html .= "  <img border=0 ";
-	$html .= "       src='linkgraph_image.php?exptidx=$exptidx";
+	$html .= "       src='linkgraph_image.php?instance=$exptidx";
 	$html .= "&graphtype=$graphtype&now=$now'>\n";
 	$html .= "</div>\n";
 

www/template_create.php

@@ -400,7 +400,7 @@ elseif (isset($_FILES['nsfile']) && $_FILES['nsfile']['size'] != 0) {
     # the php temporary file name. Note that there appears to be some kind
     # of breakage, at least in opera; filename has no path.
     #
-    $formfields[nsfile] = $_FILES['nsfile']['name'];
+    $formfields["nsfile"] = $_FILES['nsfile']['name'];
     $nsfilelocale = "remote";
 }
 else {

www/template_defs.php

@@ -1716,7 +1716,7 @@ class TemplateInstance
 	
 	$html .= "  <img border=0 ";
 	$html .= "       onLoad=\"ClearLoadingIndicators('');\" ";
-	$html .= "       src='linkgraph_image.php?exptidx=$exptidx";
+	$html .= "       src='linkgraph_image.php?instance=$exptidx";
 	$html .= "&graphtype=$graphtype${runarg}";
 	$html .= "${srcarg}${dstarg}'>\n";
 	$html .= "</div>\n";